CVE-2026-19318
Critical
Description
A stack-based buffer overflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.
SeverityCritical
CVSS9.3
Exploit probability—
ProductFireware OS
PublishedAug 28, 2026
First seenAug 28, 2026
Weakness typeCWE-121CWE-121CWE-129CWE-129CWE-191CWE-191
How to fix
Update
- WatchGuard Fireware OS2026.2.2, 12.12.2, 12.5.20, 2026.3.1 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| WatchGuard Fireware OS | 2025.0 ≤ v < 2026.2.2, 12.0 ≤ v < 12.12.2, 12.0 ≤ v < 12.5.20, 2026.3 ≤ v < 2026.3.1 | 2026.2.2, 12.12.2, 12.5.20, 2026.3.1 |
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